Pulverizing centrifugal mill.



No. 801,592. PATENTED OCT. 10, 1905. L. HUNT & W. W. WHEELER.

PULVERIZING GBNTRIPUGAL MILL.

APPLICATION FILED SEPT. 15.1904.

2 SHEETSSHEET 1.

By M1 1365:4004? Azzamey PATENTED OCT. 10, 1905.

L. HUNT & W. W. WHEELER. PULVERIZING GBNTRIPUGAL MILL.

APPLICATION FILED SEPT.15.1904.

2 SHEETS-SHEET 2.

LEIGH HUNT AND \VALTER WV. \VHEELER, OF IOLA, KANSAS.

PULVERIZING CENTRIFUGAL IVHLL.

Specification of Letters Patent.

Patented Oct. 10, 1905.

Application filed September 15, 1904. Serial No. 224,625.

:0 r1]/ whom it may concern.-

Be it known that we, LEIGH HUNT and lVALrER V. WHEELER, citizens of theUnited States, residing at Iola, in the county of Allen and State ofKansas, have invented new and useful Improvements in PulverizingCentrifugal Mills, of which the following is a specification.

This invention has relation to that class of pulveriZing-mills in whichthe material is crushed by the impact of the periphery of thecrushing-roll upon the inner surface of an annular die or ring, the rollbeing held in contact with said die or ring by'centrifugal force whenthe mill is in operation. in mills of this type it has been customary tosupport the crushing-roll upon the lower end of a vertical shaft, theupper end of the shaft being connected by a universal joint or flexiblecoupling to the hub of the driving-pulley, the roll being thus allowedto swing or gyrate around the central axis of the shaft and rollor pressagainst the inner surface of the annular die or ring with a degree ofpressure proportionate to the centrifugal speed.

The object of this invention is to provide a roll-shaft of novelconstruction whereby the universal joint or coupling heretofore employedis dispensed with, the structure and arrangement of the mill simplified,and the roll-shaftand connections materially strengthened.

To this end the present invention consists, first, in the provision, ina crushing-mill of the general type under consideration, of a rollshaftcomposed of a section of wire cable, and, second, in the combination,with the other working parts of a mill and the wire cable or flexibleroll-shaft, of special devices for the advantageous mounting of thelatter, all as hereinafter described and claimed.

In the accompanying drawings, illustrating a mill embodying ourinvention, Figurel isa side elevation of the mill. Fig. 2 is a planview, and Fig. 3 is a horizontal section on the line w :71 of Fig. 1.Fig. 1 is a vertical cross-sectional elevation of the mill.

Referring to the drawings, A designates the surmorting-frame, of anysuitable form; B, the die or ring upon the inner surface of which thematerial is crushed by the impact and pressure of the roll 0.

The side bars a a of the frame A are connected at the top by the castingD, which is formed with a central boss E, bored vertically to form abearing for the reception of the quill F, which rotates in said bearing,power being applied through the horizontal pulley Gr, keyed to the quillbelow the hearing bar or yoke D.

The quill F is a metallic tube and in amill of standard size adapted topulverizing cement materials is about sixty-seven and onehalf inches(GT-E") in length and of varying external diameter by reason of beingstepped or tenoned to form journals at its ends, its diameter beingabout eleven inches (11) at its upper end and eleven and three-quarter(11%) inches at its lower end. These proportions, however, are notmaterial. The quill has a central bore H, which is of uniformdiameter-say four inches (1) from its upper end fora distance of eleveninches, (11",) from which point it tapers or flares to seven andthree-quarter inches (7%) diameter at its lower end. The upper end ofthe quill is split for eleven inches, (11,) and the two sections aresecured together by bolts 7)?) and upon being clamped act as a grip forthe cable, which turns with the quill. The lower end of the quill hasits bearing in the lower bearing-plate K of the frame A, said platebeingforlced or U-shaped at its ends, as shown at c c, to embrace theside bars a a of the frame to which it is bolted. The bearing-plate K isbossed and bored centrally and is provided with aneleven-and-three-quarter-inch (11%") split bearing 1 for the lower endof the quill.

Attached to the lower end of the cable is a twenty-four-inch (2%)roll-body 0, through which is a tapered hole C, five inches (5") indiameter at the lower end, cut with a lefthand screw-thread, into whichscrews a split nut M, acting as a clamp to the lower end of the cable.The quill is held in place by the two ball-bearing thrust-collars N andN, respectively, one against the upper side of the lower bearingplatc Kand the other against the lower side of the top bearing-plate D.

P designates the flexible shaft constituting the principal feature ofthe invention and consisting of a wire cable of, say, four inches (4")in diameter. although this size is not essential to the invention,preferably formed with a central core of straight or twisted wire togive the proper amount of flexibility and strength. The ends of thecable are securely fastened to the quill and to the rollbody by means ofthe split end section and the split nut, as described, and the cable andthe roll-body rotate with the quill.

The employment of the flexible cable does away with the solid shaft,which it replaces, and prevents breakage throughout the mill, andespecially of the solid shaft and its contiguous parts, and simplifiesthe construction of the mill. The shaft is protected for the greaterportion of its length by the quill. The ends of the cable may be brazedor soldered together, forming a solid mass, which may be rounded andtrued to fit the sockets into which they are fitted, and will assist infastening the quill and roll-body to the shaft. Such a cable will notelongate more than three inches in ten feet, which amount may beprovided for in the construction of the mill. It will resist intensetorsional strain with no buckling and practically no shortening of theshaft. The inner core of straight or twisted wire limits the degree offlexibility, and there is no tendency of the shaft to wind up and unwindin starting and stopping the mill.

Having fully described our invention, its construction and operation, weclaim and desire Letters Patent upon the following:

1. In a pulverizing or crushing mill, a rollshaft consisting of a cablemade of wire twisted into strands, having a core of straight or twistedwires, and having the ends of said wires brazed or soldered together,forming a solid mass, in combination with a rollerbody, fastened theretoby a split nut, and a split driving-member suspension.

2. In a pulverizing or crushing mill, a rollshaft consisting of a cablemade of wire of suitable size and strength twisted into strands forminga cable of proper diameter, in combination with a roller-body fastenedthereto at its lower end, and a metallic tube or quill, havinganinternal bore to correspond with the curve or angle taken by the shaftwhen rotating; said shaft being suspended from said quill at its upperend, and rotating with said quill.

3. In a pulverizing or crushing mill, the combination of a splitdriving-member suspension, a flexible wire-cable roll-shaft and aroller-body fastened thereto at its lower end by a split nut,substantially as described.

In testimony whereof we afliX our signatures in presence of twosubscribing witnesses.

LEIGH HUNT. WALTER W. WHEELER.

itnesses:

JNo. F. GosHoRN, J. G. MITTELBAoH.

